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Theoretical Probability

A bag contain...

Question

A bag contains 5 red, 8 green and 7 white balls, One ball is drawn at random from the bag. What is the probability of getting a white ball or a green ball?

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Solution

GIVEN: A bag contains5 red, 8 green and 7 white balls
TO FIND: Probability of getting a white ball or a green ball.
Total number of balls=5+8+7=20
Total number of green or white balls=8+7=15
We know that PROBABILITY $= \frac{Number of favourable event}{Total number of event}$
Hence probability of getting a green or a white ball $= \frac{15}{20} = \frac{3}{4}$ .

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